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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '76c4758a20be8acc01a2340fbe13b33c70e7a967355edc6dcd45022be8a4d2be' 
  AND token = '2kSZ+AqU2a/whx4ovh8O+DCOO+H7QghEUk0t12juJgM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}